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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c05c04f6787cb0dc18dea5c5a0772418dba0c5d05251891fd824414ea78b39' 
  AND token = 'lTeH1S2eFyllW2q13xncz1Xuv4nAjWWZd8HmSKwpE5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00169

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}